1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #ifndef __XFS_FORMAT_H__ 19 #define __XFS_FORMAT_H__ 20 21 /* 22 * XFS On Disk Format Definitions 23 * 24 * This header file defines all the on-disk format definitions for 25 * general XFS objects. Directory and attribute related objects are defined in 26 * xfs_da_format.h, which log and log item formats are defined in 27 * xfs_log_format.h. Everything else goes here. 28 */ 29 30 struct xfs_mount; 31 struct xfs_trans; 32 struct xfs_inode; 33 struct xfs_buf; 34 struct xfs_ifork; 35 36 /* 37 * Super block 38 * Fits into a sector-sized buffer at address 0 of each allocation group. 39 * Only the first of these is ever updated except during growfs. 40 */ 41 #define XFS_SB_MAGIC 0x58465342 /* 'XFSB' */ 42 #define XFS_SB_VERSION_1 1 /* 5.3, 6.0.1, 6.1 */ 43 #define XFS_SB_VERSION_2 2 /* 6.2 - attributes */ 44 #define XFS_SB_VERSION_3 3 /* 6.2 - new inode version */ 45 #define XFS_SB_VERSION_4 4 /* 6.2+ - bitmask version */ 46 #define XFS_SB_VERSION_5 5 /* CRC enabled filesystem */ 47 #define XFS_SB_VERSION_NUMBITS 0x000f 48 #define XFS_SB_VERSION_ALLFBITS 0xfff0 49 #define XFS_SB_VERSION_ATTRBIT 0x0010 50 #define XFS_SB_VERSION_NLINKBIT 0x0020 51 #define XFS_SB_VERSION_QUOTABIT 0x0040 52 #define XFS_SB_VERSION_ALIGNBIT 0x0080 53 #define XFS_SB_VERSION_DALIGNBIT 0x0100 54 #define XFS_SB_VERSION_SHAREDBIT 0x0200 55 #define XFS_SB_VERSION_LOGV2BIT 0x0400 56 #define XFS_SB_VERSION_SECTORBIT 0x0800 57 #define XFS_SB_VERSION_EXTFLGBIT 0x1000 58 #define XFS_SB_VERSION_DIRV2BIT 0x2000 59 #define XFS_SB_VERSION_BORGBIT 0x4000 /* ASCII only case-insens. */ 60 #define XFS_SB_VERSION_MOREBITSBIT 0x8000 61 62 /* 63 * Supported feature bit list is just all bits in the versionnum field because 64 * we've used them all up and understand them all. Except, of course, for the 65 * shared superblock bit, which nobody knows what it does and so is unsupported. 66 */ 67 #define XFS_SB_VERSION_OKBITS \ 68 ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \ 69 ~XFS_SB_VERSION_SHAREDBIT) 70 71 /* 72 * There are two words to hold XFS "feature" bits: the original 73 * word, sb_versionnum, and sb_features2. Whenever a bit is set in 74 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set. 75 * 76 * These defines represent bits in sb_features2. 77 */ 78 #define XFS_SB_VERSION2_RESERVED1BIT 0x00000001 79 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT 0x00000002 /* Superblk counters */ 80 #define XFS_SB_VERSION2_RESERVED4BIT 0x00000004 81 #define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */ 82 #define XFS_SB_VERSION2_PARENTBIT 0x00000010 /* parent pointers */ 83 #define XFS_SB_VERSION2_PROJID32BIT 0x00000080 /* 32 bit project id */ 84 #define XFS_SB_VERSION2_CRCBIT 0x00000100 /* metadata CRCs */ 85 #define XFS_SB_VERSION2_FTYPE 0x00000200 /* inode type in dir */ 86 87 #define XFS_SB_VERSION2_OKBITS \ 88 (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \ 89 XFS_SB_VERSION2_ATTR2BIT | \ 90 XFS_SB_VERSION2_PROJID32BIT | \ 91 XFS_SB_VERSION2_FTYPE) 92 93 /* 94 * Superblock - in core version. Must match the ondisk version below. 95 * Must be padded to 64 bit alignment. 96 */ 97 typedef struct xfs_sb { 98 __uint32_t sb_magicnum; /* magic number == XFS_SB_MAGIC */ 99 __uint32_t sb_blocksize; /* logical block size, bytes */ 100 xfs_rfsblock_t sb_dblocks; /* number of data blocks */ 101 xfs_rfsblock_t sb_rblocks; /* number of realtime blocks */ 102 xfs_rtblock_t sb_rextents; /* number of realtime extents */ 103 uuid_t sb_uuid; /* user-visible file system unique id */ 104 xfs_fsblock_t sb_logstart; /* starting block of log if internal */ 105 xfs_ino_t sb_rootino; /* root inode number */ 106 xfs_ino_t sb_rbmino; /* bitmap inode for realtime extents */ 107 xfs_ino_t sb_rsumino; /* summary inode for rt bitmap */ 108 xfs_agblock_t sb_rextsize; /* realtime extent size, blocks */ 109 xfs_agblock_t sb_agblocks; /* size of an allocation group */ 110 xfs_agnumber_t sb_agcount; /* number of allocation groups */ 111 xfs_extlen_t sb_rbmblocks; /* number of rt bitmap blocks */ 112 xfs_extlen_t sb_logblocks; /* number of log blocks */ 113 __uint16_t sb_versionnum; /* header version == XFS_SB_VERSION */ 114 __uint16_t sb_sectsize; /* volume sector size, bytes */ 115 __uint16_t sb_inodesize; /* inode size, bytes */ 116 __uint16_t sb_inopblock; /* inodes per block */ 117 char sb_fname[12]; /* file system name */ 118 __uint8_t sb_blocklog; /* log2 of sb_blocksize */ 119 __uint8_t sb_sectlog; /* log2 of sb_sectsize */ 120 __uint8_t sb_inodelog; /* log2 of sb_inodesize */ 121 __uint8_t sb_inopblog; /* log2 of sb_inopblock */ 122 __uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 123 __uint8_t sb_rextslog; /* log2 of sb_rextents */ 124 __uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ 125 __uint8_t sb_imax_pct; /* max % of fs for inode space */ 126 /* statistics */ 127 /* 128 * These fields must remain contiguous. If you really 129 * want to change their layout, make sure you fix the 130 * code in xfs_trans_apply_sb_deltas(). 131 */ 132 __uint64_t sb_icount; /* allocated inodes */ 133 __uint64_t sb_ifree; /* free inodes */ 134 __uint64_t sb_fdblocks; /* free data blocks */ 135 __uint64_t sb_frextents; /* free realtime extents */ 136 /* 137 * End contiguous fields. 138 */ 139 xfs_ino_t sb_uquotino; /* user quota inode */ 140 xfs_ino_t sb_gquotino; /* group quota inode */ 141 __uint16_t sb_qflags; /* quota flags */ 142 __uint8_t sb_flags; /* misc. flags */ 143 __uint8_t sb_shared_vn; /* shared version number */ 144 xfs_extlen_t sb_inoalignmt; /* inode chunk alignment, fsblocks */ 145 __uint32_t sb_unit; /* stripe or raid unit */ 146 __uint32_t sb_width; /* stripe or raid width */ 147 __uint8_t sb_dirblklog; /* log2 of dir block size (fsbs) */ 148 __uint8_t sb_logsectlog; /* log2 of the log sector size */ 149 __uint16_t sb_logsectsize; /* sector size for the log, bytes */ 150 __uint32_t sb_logsunit; /* stripe unit size for the log */ 151 __uint32_t sb_features2; /* additional feature bits */ 152 153 /* 154 * bad features2 field as a result of failing to pad the sb structure to 155 * 64 bits. Some machines will be using this field for features2 bits. 156 * Easiest just to mark it bad and not use it for anything else. 157 * 158 * This is not kept up to date in memory; it is always overwritten by 159 * the value in sb_features2 when formatting the incore superblock to 160 * the disk buffer. 161 */ 162 __uint32_t sb_bad_features2; 163 164 /* version 5 superblock fields start here */ 165 166 /* feature masks */ 167 __uint32_t sb_features_compat; 168 __uint32_t sb_features_ro_compat; 169 __uint32_t sb_features_incompat; 170 __uint32_t sb_features_log_incompat; 171 172 __uint32_t sb_crc; /* superblock crc */ 173 xfs_extlen_t sb_spino_align; /* sparse inode chunk alignment */ 174 175 xfs_ino_t sb_pquotino; /* project quota inode */ 176 xfs_lsn_t sb_lsn; /* last write sequence */ 177 uuid_t sb_meta_uuid; /* metadata file system unique id */ 178 179 /* must be padded to 64 bit alignment */ 180 } xfs_sb_t; 181 182 #define XFS_SB_CRC_OFF offsetof(struct xfs_sb, sb_crc) 183 184 /* 185 * Superblock - on disk version. Must match the in core version above. 186 * Must be padded to 64 bit alignment. 187 */ 188 typedef struct xfs_dsb { 189 __be32 sb_magicnum; /* magic number == XFS_SB_MAGIC */ 190 __be32 sb_blocksize; /* logical block size, bytes */ 191 __be64 sb_dblocks; /* number of data blocks */ 192 __be64 sb_rblocks; /* number of realtime blocks */ 193 __be64 sb_rextents; /* number of realtime extents */ 194 uuid_t sb_uuid; /* user-visible file system unique id */ 195 __be64 sb_logstart; /* starting block of log if internal */ 196 __be64 sb_rootino; /* root inode number */ 197 __be64 sb_rbmino; /* bitmap inode for realtime extents */ 198 __be64 sb_rsumino; /* summary inode for rt bitmap */ 199 __be32 sb_rextsize; /* realtime extent size, blocks */ 200 __be32 sb_agblocks; /* size of an allocation group */ 201 __be32 sb_agcount; /* number of allocation groups */ 202 __be32 sb_rbmblocks; /* number of rt bitmap blocks */ 203 __be32 sb_logblocks; /* number of log blocks */ 204 __be16 sb_versionnum; /* header version == XFS_SB_VERSION */ 205 __be16 sb_sectsize; /* volume sector size, bytes */ 206 __be16 sb_inodesize; /* inode size, bytes */ 207 __be16 sb_inopblock; /* inodes per block */ 208 char sb_fname[12]; /* file system name */ 209 __u8 sb_blocklog; /* log2 of sb_blocksize */ 210 __u8 sb_sectlog; /* log2 of sb_sectsize */ 211 __u8 sb_inodelog; /* log2 of sb_inodesize */ 212 __u8 sb_inopblog; /* log2 of sb_inopblock */ 213 __u8 sb_agblklog; /* log2 of sb_agblocks (rounded up) */ 214 __u8 sb_rextslog; /* log2 of sb_rextents */ 215 __u8 sb_inprogress; /* mkfs is in progress, don't mount */ 216 __u8 sb_imax_pct; /* max % of fs for inode space */ 217 /* statistics */ 218 /* 219 * These fields must remain contiguous. If you really 220 * want to change their layout, make sure you fix the 221 * code in xfs_trans_apply_sb_deltas(). 222 */ 223 __be64 sb_icount; /* allocated inodes */ 224 __be64 sb_ifree; /* free inodes */ 225 __be64 sb_fdblocks; /* free data blocks */ 226 __be64 sb_frextents; /* free realtime extents */ 227 /* 228 * End contiguous fields. 229 */ 230 __be64 sb_uquotino; /* user quota inode */ 231 __be64 sb_gquotino; /* group quota inode */ 232 __be16 sb_qflags; /* quota flags */ 233 __u8 sb_flags; /* misc. flags */ 234 __u8 sb_shared_vn; /* shared version number */ 235 __be32 sb_inoalignmt; /* inode chunk alignment, fsblocks */ 236 __be32 sb_unit; /* stripe or raid unit */ 237 __be32 sb_width; /* stripe or raid width */ 238 __u8 sb_dirblklog; /* log2 of dir block size (fsbs) */ 239 __u8 sb_logsectlog; /* log2 of the log sector size */ 240 __be16 sb_logsectsize; /* sector size for the log, bytes */ 241 __be32 sb_logsunit; /* stripe unit size for the log */ 242 __be32 sb_features2; /* additional feature bits */ 243 /* 244 * bad features2 field as a result of failing to pad the sb 245 * structure to 64 bits. Some machines will be using this field 246 * for features2 bits. Easiest just to mark it bad and not use 247 * it for anything else. 248 */ 249 __be32 sb_bad_features2; 250 251 /* version 5 superblock fields start here */ 252 253 /* feature masks */ 254 __be32 sb_features_compat; 255 __be32 sb_features_ro_compat; 256 __be32 sb_features_incompat; 257 __be32 sb_features_log_incompat; 258 259 __le32 sb_crc; /* superblock crc */ 260 __be32 sb_spino_align; /* sparse inode chunk alignment */ 261 262 __be64 sb_pquotino; /* project quota inode */ 263 __be64 sb_lsn; /* last write sequence */ 264 uuid_t sb_meta_uuid; /* metadata file system unique id */ 265 266 /* must be padded to 64 bit alignment */ 267 } xfs_dsb_t; 268 269 270 /* 271 * Misc. Flags - warning - these will be cleared by xfs_repair unless 272 * a feature bit is set when the flag is used. 273 */ 274 #define XFS_SBF_NOFLAGS 0x00 /* no flags set */ 275 #define XFS_SBF_READONLY 0x01 /* only read-only mounts allowed */ 276 277 /* 278 * define max. shared version we can interoperate with 279 */ 280 #define XFS_SB_MAX_SHARED_VN 0 281 282 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS) 283 284 /* 285 * The first XFS version we support is a v4 superblock with V2 directories. 286 */ 287 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp) 288 { 289 if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT)) 290 return false; 291 292 /* check for unknown features in the fs */ 293 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) || 294 ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && 295 (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS))) 296 return false; 297 298 return true; 299 } 300 301 static inline bool xfs_sb_good_version(struct xfs_sb *sbp) 302 { 303 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) 304 return true; 305 if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) 306 return xfs_sb_good_v4_features(sbp); 307 return false; 308 } 309 310 /* 311 * Detect a mismatched features2 field. Older kernels read/wrote 312 * this into the wrong slot, so to be safe we keep them in sync. 313 */ 314 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp) 315 { 316 return sbp->sb_bad_features2 != sbp->sb_features2; 317 } 318 319 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp) 320 { 321 return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT); 322 } 323 324 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp) 325 { 326 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT; 327 } 328 329 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp) 330 { 331 return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT); 332 } 333 334 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp) 335 { 336 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT; 337 } 338 339 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp) 340 { 341 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 342 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT)); 343 } 344 345 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp) 346 { 347 return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT); 348 } 349 350 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp) 351 { 352 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 353 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT); 354 } 355 356 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp) 357 { 358 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 359 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT); 360 } 361 362 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp) 363 { 364 return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT); 365 } 366 367 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp) 368 { 369 return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT); 370 } 371 372 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp) 373 { 374 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 || 375 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT); 376 } 377 378 /* 379 * sb_features2 bit version macros. 380 */ 381 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp) 382 { 383 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 384 (xfs_sb_version_hasmorebits(sbp) && 385 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT)); 386 } 387 388 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp) 389 { 390 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 391 (xfs_sb_version_hasmorebits(sbp) && 392 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT)); 393 } 394 395 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp) 396 { 397 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 398 sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT; 399 } 400 401 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp) 402 { 403 sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT; 404 if (!sbp->sb_features2) 405 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT; 406 } 407 408 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp) 409 { 410 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) || 411 (xfs_sb_version_hasmorebits(sbp) && 412 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT)); 413 } 414 415 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp) 416 { 417 sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT; 418 sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT; 419 } 420 421 /* 422 * Extended v5 superblock feature masks. These are to be used for new v5 423 * superblock features only. 424 * 425 * Compat features are new features that old kernels will not notice or affect 426 * and so can mount read-write without issues. 427 * 428 * RO-Compat (read only) are features that old kernels can read but will break 429 * if they write. Hence only read-only mounts of such filesystems are allowed on 430 * kernels that don't support the feature bit. 431 * 432 * InCompat features are features which old kernels will not understand and so 433 * must not mount. 434 * 435 * Log-InCompat features are for changes to log formats or new transactions that 436 * can't be replayed on older kernels. The fields are set when the filesystem is 437 * mounted, and a clean unmount clears the fields. 438 */ 439 #define XFS_SB_FEAT_COMPAT_ALL 0 440 #define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL 441 static inline bool 442 xfs_sb_has_compat_feature( 443 struct xfs_sb *sbp, 444 __uint32_t feature) 445 { 446 return (sbp->sb_features_compat & feature) != 0; 447 } 448 449 #define XFS_SB_FEAT_RO_COMPAT_FINOBT (1 << 0) /* free inode btree */ 450 #define XFS_SB_FEAT_RO_COMPAT_ALL \ 451 (XFS_SB_FEAT_RO_COMPAT_FINOBT) 452 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL 453 static inline bool 454 xfs_sb_has_ro_compat_feature( 455 struct xfs_sb *sbp, 456 __uint32_t feature) 457 { 458 return (sbp->sb_features_ro_compat & feature) != 0; 459 } 460 461 #define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */ 462 #define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */ 463 #define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */ 464 #define XFS_SB_FEAT_INCOMPAT_ALL \ 465 (XFS_SB_FEAT_INCOMPAT_FTYPE| \ 466 XFS_SB_FEAT_INCOMPAT_SPINODES| \ 467 XFS_SB_FEAT_INCOMPAT_META_UUID) 468 469 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL 470 static inline bool 471 xfs_sb_has_incompat_feature( 472 struct xfs_sb *sbp, 473 __uint32_t feature) 474 { 475 return (sbp->sb_features_incompat & feature) != 0; 476 } 477 478 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 479 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL 480 static inline bool 481 xfs_sb_has_incompat_log_feature( 482 struct xfs_sb *sbp, 483 __uint32_t feature) 484 { 485 return (sbp->sb_features_log_incompat & feature) != 0; 486 } 487 488 /* 489 * V5 superblock specific feature checks 490 */ 491 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp) 492 { 493 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 494 } 495 496 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp) 497 { 498 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; 499 } 500 501 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp) 502 { 503 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 504 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) || 505 (xfs_sb_version_hasmorebits(sbp) && 506 (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE)); 507 } 508 509 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp) 510 { 511 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 512 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT); 513 } 514 515 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp) 516 { 517 return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 && 518 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES); 519 } 520 521 /* 522 * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID 523 * is stored separately from the user-visible UUID; this allows the 524 * user-visible UUID to be changed on V5 filesystems which have a 525 * filesystem UUID stamped into every piece of metadata. 526 */ 527 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp) 528 { 529 return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) && 530 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID); 531 } 532 533 /* 534 * end of superblock version macros 535 */ 536 537 static inline bool 538 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino) 539 { 540 return (ino == sbp->sb_uquotino || 541 ino == sbp->sb_gquotino || 542 ino == sbp->sb_pquotino); 543 } 544 545 #define XFS_SB_DADDR ((xfs_daddr_t)0) /* daddr in filesystem/ag */ 546 #define XFS_SB_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_SB_DADDR) 547 #define XFS_BUF_TO_SBP(bp) ((xfs_dsb_t *)((bp)->b_addr)) 548 549 #define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d)) 550 #define XFS_DADDR_TO_FSB(mp,d) XFS_AGB_TO_FSB(mp, \ 551 xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d)) 552 #define XFS_FSB_TO_DADDR(mp,fsbno) XFS_AGB_TO_DADDR(mp, \ 553 XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno)) 554 555 /* 556 * File system sector to basic block conversions. 557 */ 558 #define XFS_FSS_TO_BB(mp,sec) ((sec) << (mp)->m_sectbb_log) 559 560 /* 561 * File system block to basic block conversions. 562 */ 563 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log) 564 #define XFS_BB_TO_FSB(mp,bb) \ 565 (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log) 566 #define XFS_BB_TO_FSBT(mp,bb) ((bb) >> (mp)->m_blkbb_log) 567 568 /* 569 * File system block to byte conversions. 570 */ 571 #define XFS_FSB_TO_B(mp,fsbno) ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog) 572 #define XFS_B_TO_FSB(mp,b) \ 573 ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog) 574 #define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog) 575 #define XFS_B_FSB_OFFSET(mp,b) ((b) & (mp)->m_blockmask) 576 577 /* 578 * Allocation group header 579 * 580 * This is divided into three structures, placed in sequential 512-byte 581 * buffers after a copy of the superblock (also in a 512-byte buffer). 582 */ 583 #define XFS_AGF_MAGIC 0x58414746 /* 'XAGF' */ 584 #define XFS_AGI_MAGIC 0x58414749 /* 'XAGI' */ 585 #define XFS_AGFL_MAGIC 0x5841464c /* 'XAFL' */ 586 #define XFS_AGF_VERSION 1 587 #define XFS_AGI_VERSION 1 588 589 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION) 590 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION) 591 592 /* 593 * Btree number 0 is bno, 1 is cnt. This value gives the size of the 594 * arrays below. 595 */ 596 #define XFS_BTNUM_AGF ((int)XFS_BTNUM_CNTi + 1) 597 598 /* 599 * The second word of agf_levels in the first a.g. overlaps the EFS 600 * superblock's magic number. Since the magic numbers valid for EFS 601 * are > 64k, our value cannot be confused for an EFS superblock's. 602 */ 603 604 typedef struct xfs_agf { 605 /* 606 * Common allocation group header information 607 */ 608 __be32 agf_magicnum; /* magic number == XFS_AGF_MAGIC */ 609 __be32 agf_versionnum; /* header version == XFS_AGF_VERSION */ 610 __be32 agf_seqno; /* sequence # starting from 0 */ 611 __be32 agf_length; /* size in blocks of a.g. */ 612 /* 613 * Freespace information 614 */ 615 __be32 agf_roots[XFS_BTNUM_AGF]; /* root blocks */ 616 __be32 agf_spare0; /* spare field */ 617 __be32 agf_levels[XFS_BTNUM_AGF]; /* btree levels */ 618 __be32 agf_spare1; /* spare field */ 619 620 __be32 agf_flfirst; /* first freelist block's index */ 621 __be32 agf_fllast; /* last freelist block's index */ 622 __be32 agf_flcount; /* count of blocks in freelist */ 623 __be32 agf_freeblks; /* total free blocks */ 624 625 __be32 agf_longest; /* longest free space */ 626 __be32 agf_btreeblks; /* # of blocks held in AGF btrees */ 627 uuid_t agf_uuid; /* uuid of filesystem */ 628 629 /* 630 * reserve some contiguous space for future logged fields before we add 631 * the unlogged fields. This makes the range logging via flags and 632 * structure offsets much simpler. 633 */ 634 __be64 agf_spare64[16]; 635 636 /* unlogged fields, written during buffer writeback. */ 637 __be64 agf_lsn; /* last write sequence */ 638 __be32 agf_crc; /* crc of agf sector */ 639 __be32 agf_spare2; 640 641 /* structure must be padded to 64 bit alignment */ 642 } xfs_agf_t; 643 644 #define XFS_AGF_CRC_OFF offsetof(struct xfs_agf, agf_crc) 645 646 #define XFS_AGF_MAGICNUM 0x00000001 647 #define XFS_AGF_VERSIONNUM 0x00000002 648 #define XFS_AGF_SEQNO 0x00000004 649 #define XFS_AGF_LENGTH 0x00000008 650 #define XFS_AGF_ROOTS 0x00000010 651 #define XFS_AGF_LEVELS 0x00000020 652 #define XFS_AGF_FLFIRST 0x00000040 653 #define XFS_AGF_FLLAST 0x00000080 654 #define XFS_AGF_FLCOUNT 0x00000100 655 #define XFS_AGF_FREEBLKS 0x00000200 656 #define XFS_AGF_LONGEST 0x00000400 657 #define XFS_AGF_BTREEBLKS 0x00000800 658 #define XFS_AGF_UUID 0x00001000 659 #define XFS_AGF_NUM_BITS 13 660 #define XFS_AGF_ALL_BITS ((1 << XFS_AGF_NUM_BITS) - 1) 661 662 #define XFS_AGF_FLAGS \ 663 { XFS_AGF_MAGICNUM, "MAGICNUM" }, \ 664 { XFS_AGF_VERSIONNUM, "VERSIONNUM" }, \ 665 { XFS_AGF_SEQNO, "SEQNO" }, \ 666 { XFS_AGF_LENGTH, "LENGTH" }, \ 667 { XFS_AGF_ROOTS, "ROOTS" }, \ 668 { XFS_AGF_LEVELS, "LEVELS" }, \ 669 { XFS_AGF_FLFIRST, "FLFIRST" }, \ 670 { XFS_AGF_FLLAST, "FLLAST" }, \ 671 { XFS_AGF_FLCOUNT, "FLCOUNT" }, \ 672 { XFS_AGF_FREEBLKS, "FREEBLKS" }, \ 673 { XFS_AGF_LONGEST, "LONGEST" }, \ 674 { XFS_AGF_BTREEBLKS, "BTREEBLKS" }, \ 675 { XFS_AGF_UUID, "UUID" } 676 677 /* disk block (xfs_daddr_t) in the AG */ 678 #define XFS_AGF_DADDR(mp) ((xfs_daddr_t)(1 << (mp)->m_sectbb_log)) 679 #define XFS_AGF_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp)) 680 #define XFS_BUF_TO_AGF(bp) ((xfs_agf_t *)((bp)->b_addr)) 681 682 /* 683 * Size of the unlinked inode hash table in the agi. 684 */ 685 #define XFS_AGI_UNLINKED_BUCKETS 64 686 687 typedef struct xfs_agi { 688 /* 689 * Common allocation group header information 690 */ 691 __be32 agi_magicnum; /* magic number == XFS_AGI_MAGIC */ 692 __be32 agi_versionnum; /* header version == XFS_AGI_VERSION */ 693 __be32 agi_seqno; /* sequence # starting from 0 */ 694 __be32 agi_length; /* size in blocks of a.g. */ 695 /* 696 * Inode information 697 * Inodes are mapped by interpreting the inode number, so no 698 * mapping data is needed here. 699 */ 700 __be32 agi_count; /* count of allocated inodes */ 701 __be32 agi_root; /* root of inode btree */ 702 __be32 agi_level; /* levels in inode btree */ 703 __be32 agi_freecount; /* number of free inodes */ 704 705 __be32 agi_newino; /* new inode just allocated */ 706 __be32 agi_dirino; /* last directory inode chunk */ 707 /* 708 * Hash table of inodes which have been unlinked but are 709 * still being referenced. 710 */ 711 __be32 agi_unlinked[XFS_AGI_UNLINKED_BUCKETS]; 712 /* 713 * This marks the end of logging region 1 and start of logging region 2. 714 */ 715 uuid_t agi_uuid; /* uuid of filesystem */ 716 __be32 agi_crc; /* crc of agi sector */ 717 __be32 agi_pad32; 718 __be64 agi_lsn; /* last write sequence */ 719 720 __be32 agi_free_root; /* root of the free inode btree */ 721 __be32 agi_free_level;/* levels in free inode btree */ 722 723 /* structure must be padded to 64 bit alignment */ 724 } xfs_agi_t; 725 726 #define XFS_AGI_CRC_OFF offsetof(struct xfs_agi, agi_crc) 727 728 #define XFS_AGI_MAGICNUM (1 << 0) 729 #define XFS_AGI_VERSIONNUM (1 << 1) 730 #define XFS_AGI_SEQNO (1 << 2) 731 #define XFS_AGI_LENGTH (1 << 3) 732 #define XFS_AGI_COUNT (1 << 4) 733 #define XFS_AGI_ROOT (1 << 5) 734 #define XFS_AGI_LEVEL (1 << 6) 735 #define XFS_AGI_FREECOUNT (1 << 7) 736 #define XFS_AGI_NEWINO (1 << 8) 737 #define XFS_AGI_DIRINO (1 << 9) 738 #define XFS_AGI_UNLINKED (1 << 10) 739 #define XFS_AGI_NUM_BITS_R1 11 /* end of the 1st agi logging region */ 740 #define XFS_AGI_ALL_BITS_R1 ((1 << XFS_AGI_NUM_BITS_R1) - 1) 741 #define XFS_AGI_FREE_ROOT (1 << 11) 742 #define XFS_AGI_FREE_LEVEL (1 << 12) 743 #define XFS_AGI_NUM_BITS_R2 13 744 745 /* disk block (xfs_daddr_t) in the AG */ 746 #define XFS_AGI_DADDR(mp) ((xfs_daddr_t)(2 << (mp)->m_sectbb_log)) 747 #define XFS_AGI_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp)) 748 #define XFS_BUF_TO_AGI(bp) ((xfs_agi_t *)((bp)->b_addr)) 749 750 /* 751 * The third a.g. block contains the a.g. freelist, an array 752 * of block pointers to blocks owned by the allocation btree code. 753 */ 754 #define XFS_AGFL_DADDR(mp) ((xfs_daddr_t)(3 << (mp)->m_sectbb_log)) 755 #define XFS_AGFL_BLOCK(mp) XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp)) 756 #define XFS_BUF_TO_AGFL(bp) ((xfs_agfl_t *)((bp)->b_addr)) 757 758 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \ 759 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 760 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \ 761 (__be32 *)(bp)->b_addr) 762 763 /* 764 * Size of the AGFL. For CRC-enabled filesystes we steal a couple of 765 * slots in the beginning of the block for a proper header with the 766 * location information and CRC. 767 */ 768 #define XFS_AGFL_SIZE(mp) \ 769 (((mp)->m_sb.sb_sectsize - \ 770 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 771 sizeof(struct xfs_agfl) : 0)) / \ 772 sizeof(xfs_agblock_t)) 773 774 typedef struct xfs_agfl { 775 __be32 agfl_magicnum; 776 __be32 agfl_seqno; 777 uuid_t agfl_uuid; 778 __be64 agfl_lsn; 779 __be32 agfl_crc; 780 __be32 agfl_bno[]; /* actually XFS_AGFL_SIZE(mp) */ 781 } xfs_agfl_t; 782 783 #define XFS_AGFL_CRC_OFF offsetof(struct xfs_agfl, agfl_crc) 784 785 #define XFS_AGB_TO_FSB(mp,agno,agbno) \ 786 (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno)) 787 #define XFS_FSB_TO_AGNO(mp,fsbno) \ 788 ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog)) 789 #define XFS_FSB_TO_AGBNO(mp,fsbno) \ 790 ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog))) 791 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \ 792 ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \ 793 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno))) 794 #define XFS_AG_DADDR(mp,agno,d) (XFS_AGB_TO_DADDR(mp, agno, 0) + (d)) 795 796 /* 797 * For checking for bad ranges of xfs_daddr_t's, covering multiple 798 * allocation groups or a single xfs_daddr_t that's a superblock copy. 799 */ 800 #define XFS_AG_CHECK_DADDR(mp,d,len) \ 801 ((len) == 1 ? \ 802 ASSERT((d) == XFS_SB_DADDR || \ 803 xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \ 804 ASSERT(xfs_daddr_to_agno(mp, d) == \ 805 xfs_daddr_to_agno(mp, (d) + (len) - 1))) 806 807 typedef struct xfs_timestamp { 808 __be32 t_sec; /* timestamp seconds */ 809 __be32 t_nsec; /* timestamp nanoseconds */ 810 } xfs_timestamp_t; 811 812 /* 813 * On-disk inode structure. 814 * 815 * This is just the header or "dinode core", the inode is expanded to fill a 816 * variable size the leftover area split into a data and an attribute fork. 817 * The format of the data and attribute fork depends on the format of the 818 * inode as indicated by di_format and di_aformat. To access the data and 819 * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros 820 * below. 821 * 822 * There is a very similar struct icdinode in xfs_inode which matches the 823 * layout of the first 96 bytes of this structure, but is kept in native 824 * format instead of big endian. 825 * 826 * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed 827 * padding field for v3 inodes. 828 */ 829 #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ 830 #define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) 831 typedef struct xfs_dinode { 832 __be16 di_magic; /* inode magic # = XFS_DINODE_MAGIC */ 833 __be16 di_mode; /* mode and type of file */ 834 __u8 di_version; /* inode version */ 835 __u8 di_format; /* format of di_c data */ 836 __be16 di_onlink; /* old number of links to file */ 837 __be32 di_uid; /* owner's user id */ 838 __be32 di_gid; /* owner's group id */ 839 __be32 di_nlink; /* number of links to file */ 840 __be16 di_projid_lo; /* lower part of owner's project id */ 841 __be16 di_projid_hi; /* higher part owner's project id */ 842 __u8 di_pad[6]; /* unused, zeroed space */ 843 __be16 di_flushiter; /* incremented on flush */ 844 xfs_timestamp_t di_atime; /* time last accessed */ 845 xfs_timestamp_t di_mtime; /* time last modified */ 846 xfs_timestamp_t di_ctime; /* time created/inode modified */ 847 __be64 di_size; /* number of bytes in file */ 848 __be64 di_nblocks; /* # of direct & btree blocks used */ 849 __be32 di_extsize; /* basic/minimum extent size for file */ 850 __be32 di_nextents; /* number of extents in data fork */ 851 __be16 di_anextents; /* number of extents in attribute fork*/ 852 __u8 di_forkoff; /* attr fork offs, <<3 for 64b align */ 853 __s8 di_aformat; /* format of attr fork's data */ 854 __be32 di_dmevmask; /* DMIG event mask */ 855 __be16 di_dmstate; /* DMIG state info */ 856 __be16 di_flags; /* random flags, XFS_DIFLAG_... */ 857 __be32 di_gen; /* generation number */ 858 859 /* di_next_unlinked is the only non-core field in the old dinode */ 860 __be32 di_next_unlinked;/* agi unlinked list ptr */ 861 862 /* start of the extended dinode, writable fields */ 863 __le32 di_crc; /* CRC of the inode */ 864 __be64 di_changecount; /* number of attribute changes */ 865 __be64 di_lsn; /* flush sequence */ 866 __be64 di_flags2; /* more random flags */ 867 __u8 di_pad2[16]; /* more padding for future expansion */ 868 869 /* fields only written to during inode creation */ 870 xfs_timestamp_t di_crtime; /* time created */ 871 __be64 di_ino; /* inode number */ 872 uuid_t di_uuid; /* UUID of the filesystem */ 873 874 /* structure must be padded to 64 bit alignment */ 875 } xfs_dinode_t; 876 877 #define XFS_DINODE_CRC_OFF offsetof(struct xfs_dinode, di_crc) 878 879 #define DI_MAX_FLUSH 0xffff 880 881 /* 882 * Size of the core inode on disk. Version 1 and 2 inodes have 883 * the same size, but version 3 has grown a few additional fields. 884 */ 885 static inline uint xfs_dinode_size(int version) 886 { 887 if (version == 3) 888 return sizeof(struct xfs_dinode); 889 return offsetof(struct xfs_dinode, di_crc); 890 } 891 892 /* 893 * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. 894 * Since the pathconf interface is signed, we use 2^31 - 1 instead. 895 * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX. 896 */ 897 #define XFS_MAXLINK ((1U << 31) - 1U) 898 #define XFS_MAXLINK_1 65535U 899 900 /* 901 * Values for di_format 902 */ 903 typedef enum xfs_dinode_fmt { 904 XFS_DINODE_FMT_DEV, /* xfs_dev_t */ 905 XFS_DINODE_FMT_LOCAL, /* bulk data */ 906 XFS_DINODE_FMT_EXTENTS, /* struct xfs_bmbt_rec */ 907 XFS_DINODE_FMT_BTREE, /* struct xfs_bmdr_block */ 908 XFS_DINODE_FMT_UUID /* uuid_t */ 909 } xfs_dinode_fmt_t; 910 911 /* 912 * Inode minimum and maximum sizes. 913 */ 914 #define XFS_DINODE_MIN_LOG 8 915 #define XFS_DINODE_MAX_LOG 11 916 #define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG) 917 #define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG) 918 919 /* 920 * Inode size for given fs. 921 */ 922 #define XFS_LITINO(mp, version) \ 923 ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) 924 925 /* 926 * Inode data & attribute fork sizes, per inode. 927 */ 928 #define XFS_DFORK_Q(dip) ((dip)->di_forkoff != 0) 929 #define XFS_DFORK_BOFF(dip) ((int)((dip)->di_forkoff << 3)) 930 931 #define XFS_DFORK_DSIZE(dip,mp) \ 932 (XFS_DFORK_Q(dip) ? \ 933 XFS_DFORK_BOFF(dip) : \ 934 XFS_LITINO(mp, (dip)->di_version)) 935 #define XFS_DFORK_ASIZE(dip,mp) \ 936 (XFS_DFORK_Q(dip) ? \ 937 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \ 938 0) 939 #define XFS_DFORK_SIZE(dip,mp,w) \ 940 ((w) == XFS_DATA_FORK ? \ 941 XFS_DFORK_DSIZE(dip, mp) : \ 942 XFS_DFORK_ASIZE(dip, mp)) 943 944 /* 945 * Return pointers to the data or attribute forks. 946 */ 947 #define XFS_DFORK_DPTR(dip) \ 948 ((char *)dip + xfs_dinode_size(dip->di_version)) 949 #define XFS_DFORK_APTR(dip) \ 950 (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) 951 #define XFS_DFORK_PTR(dip,w) \ 952 ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip)) 953 954 #define XFS_DFORK_FORMAT(dip,w) \ 955 ((w) == XFS_DATA_FORK ? \ 956 (dip)->di_format : \ 957 (dip)->di_aformat) 958 #define XFS_DFORK_NEXTENTS(dip,w) \ 959 ((w) == XFS_DATA_FORK ? \ 960 be32_to_cpu((dip)->di_nextents) : \ 961 be16_to_cpu((dip)->di_anextents)) 962 963 /* 964 * For block and character special files the 32bit dev_t is stored at the 965 * beginning of the data fork. 966 */ 967 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip) 968 { 969 return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip)); 970 } 971 972 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev) 973 { 974 *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev); 975 } 976 977 /* 978 * Values for di_flags 979 * There should be a one-to-one correspondence between these flags and the 980 * XFS_XFLAG_s. 981 */ 982 #define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */ 983 #define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */ 984 #define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */ 985 #define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */ 986 #define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */ 987 #define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */ 988 #define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */ 989 #define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */ 990 #define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */ 991 #define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */ 992 #define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */ 993 #define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */ 994 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */ 995 #define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */ 996 #define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */ 997 #define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT) 998 #define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT) 999 #define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT) 1000 #define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT) 1001 #define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT) 1002 #define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT) 1003 #define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT) 1004 #define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT) 1005 #define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT) 1006 #define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT) 1007 #define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT) 1008 #define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT) 1009 #define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT) 1010 #define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT) 1011 #define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT) 1012 1013 #define XFS_DIFLAG_ANY \ 1014 (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \ 1015 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \ 1016 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \ 1017 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \ 1018 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM) 1019 1020 /* 1021 * Inode number format: 1022 * low inopblog bits - offset in block 1023 * next agblklog bits - block number in ag 1024 * next agno_log bits - ag number 1025 * high agno_log-agblklog-inopblog bits - 0 1026 */ 1027 #define XFS_INO_MASK(k) (__uint32_t)((1ULL << (k)) - 1) 1028 #define XFS_INO_OFFSET_BITS(mp) (mp)->m_sb.sb_inopblog 1029 #define XFS_INO_AGBNO_BITS(mp) (mp)->m_sb.sb_agblklog 1030 #define XFS_INO_AGINO_BITS(mp) (mp)->m_agino_log 1031 #define XFS_INO_AGNO_BITS(mp) (mp)->m_agno_log 1032 #define XFS_INO_BITS(mp) \ 1033 XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp) 1034 #define XFS_INO_TO_AGNO(mp,i) \ 1035 ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp))) 1036 #define XFS_INO_TO_AGINO(mp,i) \ 1037 ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp))) 1038 #define XFS_INO_TO_AGBNO(mp,i) \ 1039 (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \ 1040 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp))) 1041 #define XFS_INO_TO_OFFSET(mp,i) \ 1042 ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1043 #define XFS_INO_TO_FSB(mp,i) \ 1044 XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) 1045 #define XFS_AGINO_TO_INO(mp,a,i) \ 1046 (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i)) 1047 #define XFS_AGINO_TO_AGBNO(mp,i) ((i) >> XFS_INO_OFFSET_BITS(mp)) 1048 #define XFS_AGINO_TO_OFFSET(mp,i) \ 1049 ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp))) 1050 #define XFS_OFFBNO_TO_AGINO(mp,b,o) \ 1051 ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o))) 1052 1053 #define XFS_MAXINUMBER ((xfs_ino_t)((1ULL << 56) - 1ULL)) 1054 #define XFS_MAXINUMBER_32 ((xfs_ino_t)((1ULL << 32) - 1ULL)) 1055 1056 /* 1057 * RealTime Device format definitions 1058 */ 1059 1060 /* Min and max rt extent sizes, specified in bytes */ 1061 #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ 1062 #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ 1063 #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ 1064 1065 #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize) 1066 #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask) 1067 #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize) 1068 #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask) 1069 1070 /* 1071 * RT Summary and bit manipulation macros. 1072 */ 1073 #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb))) 1074 #define XFS_SUMOFFSTOBLOCK(mp,s) \ 1075 (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog) 1076 #define XFS_SUMPTR(mp,bp,so) \ 1077 ((xfs_suminfo_t *)((bp)->b_addr + \ 1078 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp)))) 1079 1080 #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log) 1081 #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log) 1082 #define XFS_BITTOWORD(mp,bi) \ 1083 ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp))) 1084 1085 #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b)) 1086 #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b)) 1087 1088 #define XFS_RTLOBIT(w) xfs_lowbit32(w) 1089 #define XFS_RTHIBIT(w) xfs_highbit32(w) 1090 1091 #define XFS_RTBLOCKLOG(b) xfs_highbit64(b) 1092 1093 /* 1094 * Dquot and dquot block format definitions 1095 */ 1096 #define XFS_DQUOT_MAGIC 0x4451 /* 'DQ' */ 1097 #define XFS_DQUOT_VERSION (u_int8_t)0x01 /* latest version number */ 1098 1099 /* 1100 * This is the main portion of the on-disk representation of quota 1101 * information for a user. This is the q_core of the xfs_dquot_t that 1102 * is kept in kernel memory. We pad this with some more expansion room 1103 * to construct the on disk structure. 1104 */ 1105 typedef struct xfs_disk_dquot { 1106 __be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */ 1107 __u8 d_version; /* dquot version */ 1108 __u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */ 1109 __be32 d_id; /* user,project,group id */ 1110 __be64 d_blk_hardlimit;/* absolute limit on disk blks */ 1111 __be64 d_blk_softlimit;/* preferred limit on disk blks */ 1112 __be64 d_ino_hardlimit;/* maximum # allocated inodes */ 1113 __be64 d_ino_softlimit;/* preferred inode limit */ 1114 __be64 d_bcount; /* disk blocks owned by the user */ 1115 __be64 d_icount; /* inodes owned by the user */ 1116 __be32 d_itimer; /* zero if within inode limits if not, 1117 this is when we refuse service */ 1118 __be32 d_btimer; /* similar to above; for disk blocks */ 1119 __be16 d_iwarns; /* warnings issued wrt num inodes */ 1120 __be16 d_bwarns; /* warnings issued wrt disk blocks */ 1121 __be32 d_pad0; /* 64 bit align */ 1122 __be64 d_rtb_hardlimit;/* absolute limit on realtime blks */ 1123 __be64 d_rtb_softlimit;/* preferred limit on RT disk blks */ 1124 __be64 d_rtbcount; /* realtime blocks owned */ 1125 __be32 d_rtbtimer; /* similar to above; for RT disk blocks */ 1126 __be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */ 1127 __be16 d_pad; 1128 } xfs_disk_dquot_t; 1129 1130 /* 1131 * This is what goes on disk. This is separated from the xfs_disk_dquot because 1132 * carrying the unnecessary padding would be a waste of memory. 1133 */ 1134 typedef struct xfs_dqblk { 1135 xfs_disk_dquot_t dd_diskdq; /* portion that lives incore as well */ 1136 char dd_fill[4]; /* filling for posterity */ 1137 1138 /* 1139 * These two are only present on filesystems with the CRC bits set. 1140 */ 1141 __be32 dd_crc; /* checksum */ 1142 __be64 dd_lsn; /* last modification in log */ 1143 uuid_t dd_uuid; /* location information */ 1144 } xfs_dqblk_t; 1145 1146 #define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc) 1147 1148 /* 1149 * Remote symlink format and access functions. 1150 */ 1151 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 1152 1153 struct xfs_dsymlink_hdr { 1154 __be32 sl_magic; 1155 __be32 sl_offset; 1156 __be32 sl_bytes; 1157 __be32 sl_crc; 1158 uuid_t sl_uuid; 1159 __be64 sl_owner; 1160 __be64 sl_blkno; 1161 __be64 sl_lsn; 1162 }; 1163 1164 #define XFS_SYMLINK_CRC_OFF offsetof(struct xfs_dsymlink_hdr, sl_crc) 1165 1166 /* 1167 * The maximum pathlen is 1024 bytes. Since the minimum file system 1168 * blocksize is 512 bytes, we can get a max of 3 extents back from 1169 * bmapi when crc headers are taken into account. 1170 */ 1171 #define XFS_SYMLINK_MAPS 3 1172 1173 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ 1174 ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ 1175 sizeof(struct xfs_dsymlink_hdr) : 0)) 1176 1177 1178 /* 1179 * Allocation Btree format definitions 1180 * 1181 * There are two on-disk btrees, one sorted by blockno and one sorted 1182 * by blockcount and blockno. All blocks look the same to make the code 1183 * simpler; if we have time later, we'll make the optimizations. 1184 */ 1185 #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ 1186 #define XFS_ABTB_CRC_MAGIC 0x41423342 /* 'AB3B' */ 1187 #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ 1188 #define XFS_ABTC_CRC_MAGIC 0x41423343 /* 'AB3C' */ 1189 1190 /* 1191 * Data record/key structure 1192 */ 1193 typedef struct xfs_alloc_rec { 1194 __be32 ar_startblock; /* starting block number */ 1195 __be32 ar_blockcount; /* count of free blocks */ 1196 } xfs_alloc_rec_t, xfs_alloc_key_t; 1197 1198 typedef struct xfs_alloc_rec_incore { 1199 xfs_agblock_t ar_startblock; /* starting block number */ 1200 xfs_extlen_t ar_blockcount; /* count of free blocks */ 1201 } xfs_alloc_rec_incore_t; 1202 1203 /* btree pointer type */ 1204 typedef __be32 xfs_alloc_ptr_t; 1205 1206 /* 1207 * Block numbers in the AG: 1208 * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. 1209 */ 1210 #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) 1211 #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) 1212 1213 1214 /* 1215 * Inode Allocation Btree format definitions 1216 * 1217 * There is a btree for the inode map per allocation group. 1218 */ 1219 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */ 1220 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */ 1221 #define XFS_FIBT_MAGIC 0x46494254 /* 'FIBT' */ 1222 #define XFS_FIBT_CRC_MAGIC 0x46494233 /* 'FIB3' */ 1223 1224 typedef __uint64_t xfs_inofree_t; 1225 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t)) 1226 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3) 1227 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) 1228 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) 1229 1230 #define XFS_INOBT_HOLEMASK_FULL 0 /* holemask for full chunk */ 1231 #define XFS_INOBT_HOLEMASK_BITS (NBBY * sizeof(__uint16_t)) 1232 #define XFS_INODES_PER_HOLEMASK_BIT \ 1233 (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) 1234 1235 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n) 1236 { 1237 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i; 1238 } 1239 1240 /* 1241 * The on-disk inode record structure has two formats. The original "full" 1242 * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount 1243 * and replaces the 3 high-order freecount bytes wth the holemask and inode 1244 * count. 1245 * 1246 * The holemask of the sparse record format allows an inode chunk to have holes 1247 * that refer to blocks not owned by the inode record. This facilitates inode 1248 * allocation in the event of severe free space fragmentation. 1249 */ 1250 typedef struct xfs_inobt_rec { 1251 __be32 ir_startino; /* starting inode number */ 1252 union { 1253 struct { 1254 __be32 ir_freecount; /* count of free inodes */ 1255 } f; 1256 struct { 1257 __be16 ir_holemask;/* hole mask for sparse chunks */ 1258 __u8 ir_count; /* total inode count */ 1259 __u8 ir_freecount; /* count of free inodes */ 1260 } sp; 1261 } ir_u; 1262 __be64 ir_free; /* free inode mask */ 1263 } xfs_inobt_rec_t; 1264 1265 typedef struct xfs_inobt_rec_incore { 1266 xfs_agino_t ir_startino; /* starting inode number */ 1267 __uint16_t ir_holemask; /* hole mask for sparse chunks */ 1268 __uint8_t ir_count; /* total inode count */ 1269 __uint8_t ir_freecount; /* count of free inodes (set bits) */ 1270 xfs_inofree_t ir_free; /* free inode mask */ 1271 } xfs_inobt_rec_incore_t; 1272 1273 static inline bool xfs_inobt_issparse(uint16_t holemask) 1274 { 1275 /* non-zero holemask represents a sparse rec. */ 1276 return holemask; 1277 } 1278 1279 /* 1280 * Key structure 1281 */ 1282 typedef struct xfs_inobt_key { 1283 __be32 ir_startino; /* starting inode number */ 1284 } xfs_inobt_key_t; 1285 1286 /* btree pointer type */ 1287 typedef __be32 xfs_inobt_ptr_t; 1288 1289 /* 1290 * block numbers in the AG. 1291 */ 1292 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1)) 1293 #define XFS_FIBT_BLOCK(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1)) 1294 1295 /* 1296 * The first data block of an AG depends on whether the filesystem was formatted 1297 * with the finobt feature. If so, account for the finobt reserved root btree 1298 * block. 1299 */ 1300 #define XFS_PREALLOC_BLOCKS(mp) \ 1301 (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \ 1302 XFS_FIBT_BLOCK(mp) + 1 : \ 1303 XFS_IBT_BLOCK(mp) + 1) 1304 1305 1306 1307 /* 1308 * BMAP Btree format definitions 1309 * 1310 * This includes both the root block definition that sits inside an inode fork 1311 * and the record/pointer formats for the leaf/node in the blocks. 1312 */ 1313 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */ 1314 #define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */ 1315 1316 /* 1317 * Bmap root header, on-disk form only. 1318 */ 1319 typedef struct xfs_bmdr_block { 1320 __be16 bb_level; /* 0 is a leaf */ 1321 __be16 bb_numrecs; /* current # of data records */ 1322 } xfs_bmdr_block_t; 1323 1324 /* 1325 * Bmap btree record and extent descriptor. 1326 * l0:63 is an extent flag (value 1 indicates non-normal). 1327 * l0:9-62 are startoff. 1328 * l0:0-8 and l1:21-63 are startblock. 1329 * l1:0-20 are blockcount. 1330 */ 1331 #define BMBT_EXNTFLAG_BITLEN 1 1332 #define BMBT_STARTOFF_BITLEN 54 1333 #define BMBT_STARTBLOCK_BITLEN 52 1334 #define BMBT_BLOCKCOUNT_BITLEN 21 1335 1336 typedef struct xfs_bmbt_rec { 1337 __be64 l0, l1; 1338 } xfs_bmbt_rec_t; 1339 1340 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ 1341 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; 1342 1343 typedef struct xfs_bmbt_rec_host { 1344 __uint64_t l0, l1; 1345 } xfs_bmbt_rec_host_t; 1346 1347 /* 1348 * Values and macros for delayed-allocation startblock fields. 1349 */ 1350 #define STARTBLOCKVALBITS 17 1351 #define STARTBLOCKMASKBITS (15 + 20) 1352 #define STARTBLOCKMASK \ 1353 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS) 1354 1355 static inline int isnullstartblock(xfs_fsblock_t x) 1356 { 1357 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK; 1358 } 1359 1360 static inline xfs_fsblock_t nullstartblock(int k) 1361 { 1362 ASSERT(k < (1 << STARTBLOCKVALBITS)); 1363 return STARTBLOCKMASK | (k); 1364 } 1365 1366 static inline xfs_filblks_t startblockval(xfs_fsblock_t x) 1367 { 1368 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK); 1369 } 1370 1371 /* 1372 * Possible extent formats. 1373 */ 1374 typedef enum { 1375 XFS_EXTFMT_NOSTATE = 0, 1376 XFS_EXTFMT_HASSTATE 1377 } xfs_exntfmt_t; 1378 1379 /* 1380 * Possible extent states. 1381 */ 1382 typedef enum { 1383 XFS_EXT_NORM, XFS_EXT_UNWRITTEN, 1384 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID 1385 } xfs_exntst_t; 1386 1387 /* 1388 * Incore version of above. 1389 */ 1390 typedef struct xfs_bmbt_irec 1391 { 1392 xfs_fileoff_t br_startoff; /* starting file offset */ 1393 xfs_fsblock_t br_startblock; /* starting block number */ 1394 xfs_filblks_t br_blockcount; /* number of blocks */ 1395 xfs_exntst_t br_state; /* extent state */ 1396 } xfs_bmbt_irec_t; 1397 1398 /* 1399 * Key structure for non-leaf levels of the tree. 1400 */ 1401 typedef struct xfs_bmbt_key { 1402 __be64 br_startoff; /* starting file offset */ 1403 } xfs_bmbt_key_t, xfs_bmdr_key_t; 1404 1405 /* btree pointer type */ 1406 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t; 1407 1408 1409 /* 1410 * Generic Btree block format definitions 1411 * 1412 * This is a combination of the actual format used on disk for short and long 1413 * format btrees. The first three fields are shared by both format, but the 1414 * pointers are different and should be used with care. 1415 * 1416 * To get the size of the actual short or long form headers please use the size 1417 * macros below. Never use sizeof(xfs_btree_block). 1418 * 1419 * The blkno, crc, lsn, owner and uuid fields are only available in filesystems 1420 * with the crc feature bit, and all accesses to them must be conditional on 1421 * that flag. 1422 */ 1423 struct xfs_btree_block { 1424 __be32 bb_magic; /* magic number for block type */ 1425 __be16 bb_level; /* 0 is a leaf */ 1426 __be16 bb_numrecs; /* current # of data records */ 1427 union { 1428 struct { 1429 __be32 bb_leftsib; 1430 __be32 bb_rightsib; 1431 1432 __be64 bb_blkno; 1433 __be64 bb_lsn; 1434 uuid_t bb_uuid; 1435 __be32 bb_owner; 1436 __le32 bb_crc; 1437 } s; /* short form pointers */ 1438 struct { 1439 __be64 bb_leftsib; 1440 __be64 bb_rightsib; 1441 1442 __be64 bb_blkno; 1443 __be64 bb_lsn; 1444 uuid_t bb_uuid; 1445 __be64 bb_owner; 1446 __le32 bb_crc; 1447 __be32 bb_pad; /* padding for alignment */ 1448 } l; /* long form pointers */ 1449 } bb_u; /* rest */ 1450 }; 1451 1452 #define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */ 1453 #define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */ 1454 1455 /* sizes of CRC enabled btree blocks */ 1456 #define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40) 1457 #define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48) 1458 1459 #define XFS_BTREE_SBLOCK_CRC_OFF \ 1460 offsetof(struct xfs_btree_block, bb_u.s.bb_crc) 1461 #define XFS_BTREE_LBLOCK_CRC_OFF \ 1462 offsetof(struct xfs_btree_block, bb_u.l.bb_crc) 1463 1464 /* 1465 * On-disk XFS access control list structure. 1466 */ 1467 struct xfs_acl_entry { 1468 __be32 ae_tag; 1469 __be32 ae_id; 1470 __be16 ae_perm; 1471 __be16 ae_pad; /* fill the implicit hole in the structure */ 1472 }; 1473 1474 struct xfs_acl { 1475 __be32 acl_cnt; 1476 struct xfs_acl_entry acl_entry[0]; 1477 }; 1478 1479 /* 1480 * The number of ACL entries allowed is defined by the on-disk format. 1481 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is 1482 * limited only by the maximum size of the xattr that stores the information. 1483 */ 1484 #define XFS_ACL_MAX_ENTRIES(mp) \ 1485 (xfs_sb_version_hascrc(&mp->m_sb) \ 1486 ? (XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \ 1487 sizeof(struct xfs_acl_entry) \ 1488 : 25) 1489 1490 #define XFS_ACL_MAX_SIZE(mp) \ 1491 (sizeof(struct xfs_acl) + \ 1492 sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp))) 1493 1494 /* On-disk XFS extended attribute names */ 1495 #define SGI_ACL_FILE "SGI_ACL_FILE" 1496 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT" 1497 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 1498 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 1499 1500 #endif /* __XFS_FORMAT_H__ */ 1501